Depending on how much they drink on earth it can vary between 1-8 days as you don't die straight away.
yes. no.
Without a period, this sentence is incomplete or Humans cannot live without food or water.
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People need water to live.
Yes humans can live with out heads if they are an zombie.
Humans cannot live without water but they require more than just water alone to survive. Water provides no nutrition which can only be obtain but consuming food.
Well the things that humans do need are water/food safety shelter that's all what we really need.
Without water, humans and the different types of food they eat, cannot survive. An average human can only live without water for about 3 days, so if there is no water, then humans can't survive. So, aslong as humans and/or any other living thing that needs water is alive, water will always be a necessity.
we can not live without water, vegetables, protein and meat. Foods that we could live without are greasy foods,soft drinks and some other rich in fat and sugar foods.
grass we can always live without grass
I guess you could say that humans get their energy indirectly through food nutrients. Food, of all sorts, contain calories, calories are energy. Humans need protein, fat and carbohydrates to live, not to mention water. It is a known fact that a human can live only 5 days without water, but can live up to 30 days without solid food.
yes some crows live in the canadian wilderness